Steve Hardy at Creative Generalistbreaks down the book, "The Wisdom of Crowds." What the book has to say about group knowledge applies directly to the ideaFestival post earlier today, "Reviewing peer review." Diversity, independence and, in some cases, decentralization, keeps group knowledge fresh. And without meaningful challenge, groups will eventually turn inward, characterized more by what they exclude and subverting, perhaps unintentionally, intellectual honesty.